[rules-users] Drools Planner: what if possible values of a PlanningVariable are dependent of another one?

[Geoffrey De Smet]

On 08-05-14 10:08, dBijkoo wrote:
> Im dealing with the almost the same problem as the original poster. The only
> difference is that the subset of entity specific variables and the total
> amount of possible variables spread over all entity specific variables has a
> factor of up to 24 in between them. This combined with the amount of enities
> makes it a huge increase in total amount of possibilities. This gives me the
> feeling that using the evaluation class wastes a lot of time evaluation
> solution which would never be viable.
>
> Since the original post is 1 and a half years old and a lot of new versions
> have been released since then, I was wondering if the same solution applies
> to my problem aswell and how it compares to my solution which i described
> below.
>
>
> At the moment i solved it as follows:
> PlanningEntity A has the following @PlanningVariable annotation
>
> a class x where the @ValueRangeProvider of x is provided by the
> @PlanningSolution annotated class.
> a class y where the @ValueRangeProvider uses x to provide the subset of
> classes y if x is not null, otherwise it returns an empty list<Y> (code
> below)
>
>      @ValueRangeProvider(id = "timePeriods")
>      public List<Period> getTimePeriods(){
>          ScheduleBlock s = getScheduleBlock();
>          if(s == null) {
>              return new ArrayList<Period>();
>          }
>          return getScheduleBlock().getTimePeriods();
>      }
>
> This feels like a hack/workaround for the problem but feel free to let me
> know what you think,

In OptaPlanner's architecture current philosophy, this is not legal:
a value range should be stable for each variable (of each entity) during 
solving.
This not guaranteed to work (and it is guaranteed not to work if you do 
phase caching of moves:
it will invalidly exclude part of the search space).
If it does work for you, I am interested to know more about this - so I 
can consider to make this approach legal.



>
> Thanks
>
>
>
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